Wild populations of Chlamys farreri derived from Japan and China are used as parents in a cross breeding experiment conducted in Zhangzi Island of Liaoning Province in the early May of 2000. Four different first filial generations of the crossbreeding, namely JC, CJ, CC and JJ, which represent different cross combinations of the parents, are differentiated from each other in some observed quantitative traits including survival rate, hatchery rate and attachment rate, etc. By ANOVA analysis, significant differences in growth rate are found among the four populations of the offspring after one year of culturing in Shandong Province. JJ population shows the fastest growth rate and has shell height of 46.1±0.71(SD)mm in average, whereas the other three populations, CC, CJ and JC, has the shell height of 43.1±0.42mm, 41.5±0.48mm and 37.2 ±0.31mm, respectively. No heterosis is detected in the experiment.
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